Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 74

Commissioning, inspection, maintenance
Further details regarding the individual steps
A
A Ignition electrodes
1. Pull the cables from the electrodes.
2. Release the nuts and remove the
electrodes.
3. Check the electrodes for wear and
contamination.
4. Clean the electrodes with a small
brush (not with a wire brush) or sand-
paper.
74
B
B Ionisation electrode
5. If the electrodes are damaged,
replace the electrodes with the gas-
ket. Tighten the electrode fixing
screws with 1.5 Nm.
(cont.)